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  1. By: United States. Department of Agriculture.
    Publication info: [Washington, D.C.] :U.S. Dept. of Agriculture,1991.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Biological control  Hypera postica  life cycle (organisms)  Medicago sativa  Microctonus  Parasites  United States  
  2. By: Alexander, R.R. - Shearer, R.C. - Shepperd, W.D.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Abies lasiocarpa  Ecological succession  Geographical distribution  Habitats  life cycle (organisms)  North America  Plant communities